Answer: B. -6,5,4
Step-by-step explanation:
To find the coeffiecient in 
-6x +5y + 4x + 9
we will first have to know what coefficients are. 
Coefficients are constant quantitiy placed before a variable, this contant quantity must be placed in such a way that it is multiplying the variable. 
So, from the above definition; we can deduct that -6 is placed before the variable x and it is multiplying x. 
-6 is a coefficient of x. 
5 is placed before the variable y and is multiplying y, then 5 is a coefficient of y. 
4 is placed before the variable x and is multiplying x, then 4 is a co-efficient of x
But 9 is not attached to any variable, so 9 cannot be called a coefficient but rather 9 is just a CONSTANT. 
Therefore the coefficients are; -6, 5 and 4